/**
 * Created by Administrator on 2016/6/1.
 */
public class DuBo {
    public static void main(String[] args) {
        int crash  = 10000;
        int count = 1;
        for (int i = 1; i <= 7; i++) {
            crash -= count* 50;
            count = count*2;
        }
        System.out.println(crash);
    }
}
